function getQuery(variable)
{
       var query = window.location.search.substring(1);
       var vars = query.split("&");
       for (var i=0;i<vars.length;i++) {
               var pair = vars[i].split("=");
               if(pair[0] == variable){return pair[1];}
       }
       return(false);
}


function $(id){
    return document.getElementById(id);
}

function fileChange(fileFormId,imgId){
 var reader = new FileReader();//定义文件读取流对象           
 reader.readAsDataURL(document.getElementById(fileFormId).files[0]);
 reader.onload = function (ev) {
    document.getElementById(imgId).src = ev.target.result;
 }
}
